+ One positive - Anode + One negative - Cathode. http://americanhistory.si.edu/fuelcells/index.htmThe reactions take place at the electrodesmajorityIntroductionwww.green-planet-solar-energy.comhttp://www.global-hydrogen-bus-platform.com/Technology/HydrogenProduction/reformingElectrolysisPure hydrogen does not occur naturally